"The Mummy: Tomb of the Dragon Emperor," starring Brendan Fraser and Jet Li, grossed $42.45 million in its debut weekend, but that still left it lagging behind "Dark Knight," which pulled in $43.8 million in its third week.

"Step Brothers" moved to No. 3 with $16.3 million in estimated ticket sales, followed by "Mamma Mia!" at $13.12 million and "Journey to the Center of the Earth" at $6.88 million.

Another new movie, "Swing Vote," a political comedy featuring Kevin Costner, came in at No. 6 with $6.3 million.

Rounding out the top tier were "Hancock," $5.2 million; "Wall-E," $4.75 million; "The X-Files: I Want to Believe," $3.43 million; and "Space Chimps," 2.84 million.

Falling out of the Top 10 were "Hellboy II: The Golden Army" and "Wanted."

Dupri party disrupted by gunshots

ATLANTA, Aug. 3 (UPI) -- Rapper Jermaine Dupri says his party at an Atlanta nightclub was disrupted by gunfire, which left a security guard with minor injuries.

Dupri told People.com no one close to him was injured early Saturday when someone fired a gun inside the Dreamz ATL nightclub where rappers Nelly and Usher also were partying.

"I'm sad this incident happened because it interrupted a beautiful and loving party. But I'm happy none of my people or friends got hurt. And the party continues," Dupri said.

DeKalb County police spokesman Marcus Hodge said the incident occurred after club security guards double-charged several attendees.

A party guest identified only as Nigel D told People.com that following the shooting, police detained all guests until an initial investigation could be conducted.

"I got outside, and the cops shut the club down," the guest said. "No one inside could leave and no one outside in the parking lot could leave either. One of my friends was stuck inside the club and people were scared that the shooter was still inside."

The unidentified sources said the younger Ross was leaving a parking lot Saturday in her Land Rover, when the vehicle was struck by an oncoming car, TMZ.com reported.

As a precaution, Ross and a passenger in her vehicle were taken to a hospital for examinations.

Two passengers in the other vehicle informed responding paramedics they had suffered back and neck injuries, TMZ.com said.

There had been no reported arrests tied to the accident, the entertainment news Web site said.

Bonet joins 'Life on Mars' adaptation

LOS ANGELES, Aug. 3 (UPI) -- Actress Lisa Bonet, known best for her role on "The Cosby Show," has joined a U.S. adaptation of the British TV series "Life on Mars," sources say.

Sources told EW.com exclusively that the 40-year-old actress, who played Denise Huxtable on the popular 1980s TV series, joined the cast of the upcoming ABC adaptation, the Web site reported Friday.

The actress will play the girlfriend of actor Jason O'Mara's character, the sources say.

The police drama, which is set in two time periods, recently added another actress to play another one of the main character's love interests. EW.com said actress Gretchen Mol, who has appeared in movies such as "3:10 to Yuma" and "The Ten," will play the character's girlfriend in 1973.

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